--- /dev/null
+// run-rustfix
+
+#![warn(clippy::iter_nth_zero)]
+use std::collections::HashSet;
+
+struct Foo {}
+
+impl Foo {
+ fn nth(&self, index: usize) -> usize {
+ index + 1
+ }
+}
+
+fn main() {
+ let f = Foo {};
+ f.nth(0); // lint does not apply here
+
+ let mut s = HashSet::new();
+ s.insert(1);
+ let _x = s.iter().next();
+
+ let mut s2 = HashSet::new();
+ s2.insert(2);
+ let mut iter = s2.iter();
+ let _y = iter.next();
+
+ let mut s3 = HashSet::new();
+ s3.insert(3);
+ let mut iter2 = s3.iter();
+ let _unwrapped = iter2.next().unwrap();
+}